Scala 操作Mysql

一、工具IDEA+MAVEN

二、Pom文件添加依赖 
1、更改成自己的scala版本

<properties>
    <scala.version>2.11.8</scala.version>
  </properties>

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2、添加驱动依赖

 <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.12</version>
    </dependency>

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三、代码书写 
1、DBUtils

package com.encapsulation
import java.sql
import java.sql.{Connection, DriverManager}
/**
  * Created by A chun on 2017/10/18.
  */
object DBUtils {
  val IP = "127.0.0.1"
  val Port = "3306"
  val DBType = "mysql"
  val DBName = "scala"
  val username = "root"
  val password = "123456"
  val url = "jdbc:" + DBType + "://" + IP + ":" + Port + "/" + DBName
  classOf[com.mysql.jdbc.Driver]

  def getConnection(): Connection = {
    DriverManager.getConnection(url, username, password)
  }
  def close(conn: Connection): Unit = {
    try {
      if (!conn.isClosed() || conn != null) {
        conn.close()
      }
    }
    catch {
      case ex: Exception => {
        ex.printStackTrace()
      }
    }
  }
}

2、Operations

package com.encapsulation
import com.encapsulation.DBUtils.close

import scala.collection.mutable
import scala.collection.mutable.ArrayBuffer
class Operations {
  case class User(id: String, name: String, age: Int)
  //insert
  def add(user: User): Boolean = {
    val conn = DBUtils.getConnection()
    try {
      val sql = new StringBuilder()
        .append("INSERT INTO user(id, name, age)")
        .append("     VALUES(?, ?, ?)")
      val pstm = conn.prepareStatement(sql.toString())
      pstm.setObject(1, user.id)
      pstm.setObject(2, user.name)
      pstm.setObject(3, user.age)

      pstm.executeUpdate() > 0
    }
    finally {
      conn.close()
    }
  }
  //delete
  def delete(id: String): Boolean = {
    val conn = DBUtils.getConnection()
    try {
      val sql = "DELETE FROM user WHERE id = ?"
      val pstm = conn.prepareStatement(sql)
      pstm.setObject(1, id)
      pstm.executeUpdate() > 0
    }
    finally {
      conn.close()
    }
  }
  //update
  def modify(user: User): Boolean = {
    val conn = DBUtils.getConnection()
    try {
      val sql = "UPDATE user SET age = ? WHERE id = ?"
      val pstm = conn.prepareStatement(sql)
      pstm.setObject(1, user.age)
      pstm.setObject(2, user.id)

      pstm.executeUpdate() > 0
    }
    finally {
      conn.close()
    }
  }
  //select
  def query(id: Int): ArrayBuffer[mutable.HashMap[String, Any]] = {
    val conn = DBUtils.getConnection()
    try {
      val sql = new StringBuilder()
        .append("SELECT name, age")
        .append("  FROM user")
        .append(" WHERE id >  ?")
      val pstm = conn.prepareStatement(sql.toString())
      pstm.setObject(1, id)
      val rs = pstm.executeQuery()
      val rsmd = rs.getMetaData()
      val size = rsmd.getColumnCount()
      val buffer = new ArrayBuffer[mutable.HashMap[String, Any]]()
      while (rs.next()) {
        val map = mutable.HashMap[String, Any]()
        for (i <- 1 to size) {
          map += (rsmd.getColumnLabel(i) -> rs.getString(i))
        }
        buffer += map
      }

      buffer
    }
    finally {
      conn.close()
    }
  }
}

3、MySQLOperations

package com.encapsulation

object MySQLOperations {
  def main(args: Array[String]): Unit = {
    val op = new Operations()
    val user = op.User("5", "Allen", 34)
    //Insert
    //println(op.add(user))

    //Delete
    println(op.delete("5"))

    //update
    //println(op.update(user))
  }
}